John P & Sarah Williams - parents of Benjamin Franklin Williams

I'm looking for any information that can be offered on John P Williams and his wife Sarah.

The furthest back I can get on them is the Pipe Creek Township, Madison Indiana 1850 census which shows the following:

John P Williams, age 56, b. in NC Sarah Williams, age 45, b. in Pennsylvania Enoch Williams, age 17 William Williams, age 13 Leroy Williams, age 12 Rebecca Williams, age 11 Benjamin Williams, age 9

All of the children were born in Indiana.

I cannot find any of them on the 1860 or 1870 censuses, but I find Benjamin Franklin Williams and his wife Sarah Staley on the 1880 Harmony Township, Posey County, Indiana census with their son George Washington Williams.

Any help in finding the missing years of 1860 and 1870, as well as any additional information on John P Williams, would be greatly appreciated.

Just a note...there is another John P Williams of a different age, who is married to Martha.That is not the John P that I am looking for.